Oakton (WD-35653-10) TDS 447 Pouch (300 PPM) 20 pouches-box
Standardized against NIST standards, premixed, and ready to use. Pouch contains a solution with a TDS of 300 ppm used as a calibration solution. "Singles" are convenient for high-precision calibration on-the-go.
- Ideal for field calibration.
- NIST traceable materials.
- ±1% accuracy at 25°C.